Spec Clutch SB394 Stage 4 Clutch Kit - Carbon Semi-Metallic Puck Disc

The SPEC SB394 Stage 4 Clutch Kit is engineered for heavily modified, high-output engines where maximum torque capacity, instantaneous engagement, and reduced rotating mass are the top priorities. This is a dedicated motorsport clutch designed for competitors who demand the absolute limit in clutch performance.

The Stage 4 is a solid hub version of the SPEC Stage 3, stepping up engagement aggression and torque holding capability. The hub features a solid 8-rivet construction with a heat-treated assembly for exceptional strength and durability under sustained high-load conditions. The carbon semi-metallic friction disc is available in 3, 4, or 6-puck configurations, allowing tuners to dial in the right balance of engagement sharpness and drivetrain shock.

Kit Contents:

• High clamp load performance pressure plate
• Carbon semi-metallic puck disc (3, 4, or 6-puck configuration)
• Solid 8-rivet, heat-treated rigid hub and carrier assembly
• Pilot bearing
• Installation tool kit

Key Features:

• Solid rigid hub — eliminates torsional compliance for direct, instantaneous power transfer
• Carbon semi-metallic friction material — high heat tolerance and excellent torque capacity
• High clamp pressure plate — maximizes clamping force for heavily modified engines
• Heat-treated assembly — built to withstand the rigors of sustained competition use
• Multiple puck configurations — 3, 4, or 6-puck disc options available

Recommended Applications: Drag Racing, Drift, Road Racing, Rallye, Pulling, Circle Track

Note: The Stage 4 is not recommended for street use. The solid hub and puck disc design produce harsh, aggressive engagement characteristics suited exclusively to competition environments.